CN217129911U

CN217129911U - Axial flow fan and large hub ratio axial flow fan blade thereof

Info

Publication number: CN217129911U
Application number: CN202220232859.5U
Authority: CN
Inventors: 高文铭; 周会中; 柴水华; 韩小红; 洪银川
Original assignee: Ningbo Langdi Impeller Machinery Co Ltd
Current assignee: Ningbo Langdi Impeller Machinery Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-08-05
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to a fan blade field especially relates to an axial fan and big wheel hub thereof is than axial fan blade. An axial flow fan blade with a large hub ratio comprises a hub and a plurality of axial flow blades regularly arranged on the outer side wall of the hub along the circumferential direction; the ratio of the outer diameter D of the hub to the outer diameter D of the fan blade is larger than 1/2. The axial flow fan blade has higher strength, is suitable for high-speed occasions (the rotating speed is more than 2800 rpm), and can obtain higher static pressure and bring larger lift at the same time of large wind volume.

Description

Axial flow fan and large hub ratio axial flow fan blade thereof

Technical Field

The utility model relates to a fan blade field especially relates to an axial fan and big wheel hub thereof is than axial fan blade.

Background

The axial flow fan has a very wide application, namely, the axial flow fan and the fan blade have the same direction of air flow, such as an electric fan, and an air conditioner outer machine fan is an axial flow type running fan. The "axial flow" is so called because the gas flows parallel to the fan axis. The blade in the axial-flow fan of the conventional axial-flow fan has larger proportion and smaller proportion of the hub, has weaker strength but can improve larger air volume, is suitable for occasions with higher flow requirement and lower pressure requirement, and the rotating speed of the suitable occasions is generally below 1500 rpm. However, the conventional axial flow fan blade is difficult to apply to the application scene of high-speed rotation.

Disclosure of Invention

In order to solve the above problem, an object of the utility model is to provide a big wheel hub is than axial compressor fan blade, and this axial compressor fan blade's intensity is higher, is suitable for high-speed occasion (rotational speed > 2800 rpm), can obtain higher static pressure when big amount of wind, brings bigger lift.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an axial flow fan blade with a large hub ratio comprises a hub and a plurality of axial flow blades regularly arranged on the outer side wall of the hub along the circumferential direction; the method is characterized in that: the ratio of the outer diameter D of the hub to the outer diameter D of the fan blade is larger than 1/2.

The above technical scheme is adopted in the utility model, this technical scheme relates to a big wheel hub is than axial compressor fan blade, and this big wheel hub has arranged multi-disc axial compressor blade than the wheel hub outside circumference rule of axial compressor fan blade. Compared with the prior art, the fan blade has the advantages that the proportion of the hub in the fan blade is large, and particularly the ratio of the outer diameter D of the hub to the outer diameter D of the fan blade is larger than 1/2. The axial flow fan blade with the structure has higher strength, is suitable for high-speed occasions (the rotating speed is more than 2800 rpm), and can obtain higher static pressure and bring larger lift at the same time of large wind volume.

In a further preferred scheme, the back pressure surface of the axial flow blade is recessed towards the pressure surface to form a recessed area, the recessed area extends from the inner edge of the axial flow blade to the middle of the axial flow blade, the front end of the recessed area extends to the front edge of the blade, and the rear end of the recessed area extends to the rear edge of the blade. The axial fan blade that above-mentioned technical scheme provided is applicable to pressure requirement higher, the big occasion of lift distance, this scheme constitutes at axial fan blade's back pressure face and forms the depressed area, reveal the air current of back pressure face from the blade pressure face (from the blade outer side), produce the vortex at the back pressure face, and peel off to the rear edge portion from the leading edge portion of back pressure face, and the indent design of back pressure face, can restrain peeling off of vortex, interior recess air current flows slowly, the atmospheric pressure is low, the surface air current is fast, the atmospheric pressure is high, make the vortex stay interior recess, reduce aerodynamic loss, the efficiency is improved, reduce the vortex noise simultaneously.

In a further preferred aspect, the outer edge portion of the axial flow blade is disposed obliquely upward with respect to the depressed region.

Furthermore, the distance between the outer edge of the depressed area and the outer edge of the blade is L, the outer diameter of the hub is D, and the outer diameter of the fan blade is D; the following formula is satisfied: l = (D-D)/12 to (D-D)/6.

Preferably, a first groove is formed in the end portion, facing the pressure surface, of the hub, a shaft sleeve connected with a motor shaft is arranged in the center of the first groove, a plurality of reinforcing ribs are arranged in the first groove along the circumferential direction of the shaft sleeve, the outer side wall of each reinforcing rib is connected to the inner side wall of the hub, and the lower side wall of each reinforcing rib is connected to the bottom surface of the corresponding first groove. In this scheme, set up the shaft liner connection motor shaft in wheel hub's the first recess to promote the intensity of wheel hub part through many strengthening ribs.

Preferably, a second groove is formed in the end portion, facing the back pressure surface, of the hub, and the second groove is a circular truncated cone-shaped notch with a small inner end caliber and a large outer end caliber. In the scheme, the second groove is formed in the other side of the hub, the thickness of the hub is reduced due to the construction of the second groove, the weight of the hub is reduced, and therefore the overall weight of the fan blade is reduced. Moreover, the second groove is a truncated cone-shaped notch with a small inner end caliber and a large outer end caliber, so that the influence on the strength of the hub can be reduced as much as possible on the basis of reducing the weight.

The utility model provides an axial fan, includes motor and axial fan blade, its characterized in that: the axial flow fan blade is the large hub ratio axial flow fan blade.

Drawings

Fig. 1 is a perspective view of an axial flow fan blade with a large hub ratio.

FIG. 2 is an end axial view of a large hub ratio axial flow fan blade.

FIG. 3 is a cross-sectional view of an axial flow blade with a large hub ratio.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

as shown in fig. 1-3, the present embodiment relates to an axial-flow fan blade with a large hub ratio, which includes a hub 1 and a plurality of axial-flow blades 2 regularly arranged on the outer sidewall of the hub 1 along the circumferential direction; the ratio of the outer diameter D of the hub 1 to the outer diameter D of the fan blade is greater than 1/2; specifically, in the scheme shown in the figure, the outer diameter D of the hub 1 is 68cm, the outer diameter D of the fan blade is 132cm, and the ratio is 0.515. The large hub 1 is circumferentially and regularly provided with a plurality of axial flow blades 2 compared with the outer side of the hub 1 of the axial flow blade. Compared with the prior art, the fan blade has the advantages that the proportion of the hub 1 in the fan blade is large, and particularly the ratio of the outer diameter D of the hub 1 to the outer diameter D of the fan blade is larger than 1/2. The axial flow fan blade with the structure has higher strength, is suitable for high-speed occasions (the rotating speed is more than 2800 rpm), and can obtain higher static pressure and bring larger lift at the same time of large wind volume.

In a further preferred scheme, a back pressure surface of the axial flow blade 2 is recessed towards a pressure surface to form a recessed area 21, the outer edge 201 part of the axial flow blade 2 is arranged obliquely upwards relative to the recessed area 21, the distance between the outer edge of the recessed area and the outer edge of the blade is L, the outer diameter of a hub is D, and the outer diameter of a fan blade is D; the following formula is satisfied: l = (D-D)/12 to (D-D)/6. The recessed area 21 extends from the inner edge of the axial flow fan blade to the middle of the axial flow fan blade 2, and the front end of the recessed area 21 extends to the front edge 202 of the blade, and the rear end extends to the rear edge 203 of the blade. The axial fan blade that above-mentioned technical scheme provided is applicable to pressure requirement and is higher, the big occasion of lift distance, this scheme constructs at axial fan blade 2's back pressure face and forms depressed area 21, the air current that reveals the back pressure face from the blade pressure face is from the blade outer side, produce the vortex at the back pressure face, and peel off to trailing edge 203 portion from the leading edge 202 portion of back pressure face, and the indent design of back pressure face, can restrain peeling off of vortex, interior concave part air current flows slowly, the atmospheric pressure is low, the surface air current is fast, the atmospheric pressure is high, make the vortex stay interior concave part, reduce pneumatic loss, the efficiency is improved, reduce the vortex noise simultaneously.

In addition, as shown in fig. 3, a first groove 11 is provided on an end portion of the hub 1 facing the pressure surface, a sleeve 12 connected to the motor shaft is provided at a center of the first groove 11, a plurality of ribs 13 are arranged in the first groove 11 along a circumferential direction of the sleeve 12, an outer side wall of each rib 13 is connected to an inner side wall of the hub 1, and a lower side wall is connected to a bottom surface of the first groove 11. In the scheme, a shaft sleeve 12 is arranged in a first groove 11 of the hub 1 and connected with a motor shaft, and the strength of the hub 1 is improved through a plurality of reinforcing ribs 13. The end part of the hub 1 facing the back pressure surface is provided with a second groove 14, and the second groove 14 is a circular truncated cone-shaped notch with a small inner end caliber and a large outer end caliber. Set up second recess 14 in this scheme at 1 opposite side of wheel hub, the structure of second recess 14 has reduced 1 thickness of wheel hub, has reduced 1 weight of wheel hub to reduce the whole weight of fan blade. Moreover, the second groove 14 is a truncated cone-shaped recess with a small inner end caliber and a large outer end caliber, so that the influence on the strength of the hub 1 can be reduced as much as possible on the basis of reducing the weight.

Example 2:

the embodiment relates to an axial flow fan, which comprises a motor and axial flow fan blades, wherein the axial flow fan blades are the axial flow fan blades with the large hub 1 ratio as described in embodiment 1.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. An axial flow fan blade with a large hub ratio comprises a hub (1) and a plurality of axial flow blades (2) regularly arranged on the outer side wall of the hub (1) along the circumferential direction; the method is characterized in that: the ratio of the outer diameter D of the hub (1) to the outer diameter D of the fan blade is larger than 1/2.

2. The axial-flow fan blade with the large hub ratio as claimed in claim 1, wherein: the back pressure surface of the axial flow blade (2) is concave inwards towards the pressure surface to form a concave area (21), the concave area (21) extends from the inner edge of the axial flow blade to the middle part of the axial flow blade (2), the front end of the concave area (21) extends to the front edge (202) of the blade, and the rear end of the concave area extends to the rear edge (203) of the blade.

3. The axial-flow fan blade with the large hub ratio as claimed in claim 2, wherein: the outer edge (201) of the axial flow blade (2) is arranged obliquely upwards relative to the recessed area (21).

4. The axial-flow fan blade with the large hub ratio as claimed in claim 2, wherein: the distance between the outer edge of the depressed area and the outer edge (201) of the blade is L, the outer diameter of the hub is D, and the outer diameter of the fan blade is D; the following formula is satisfied: l is (D-D)/12 to (D-D)/6.

5. The axial-flow fan blade with the large hub ratio as claimed in claim 1, wherein: the end part of one side, facing the pressure surface, of the hub (1) is provided with a first groove (11), the center of the first groove (11) is provided with a shaft sleeve (12) connected with a motor shaft, a plurality of reinforcing ribs (13) are arranged in the first groove (11) along the circumferential direction of the shaft sleeve (12), the outer side wall of each reinforcing rib (13) is connected to the inner side wall of the hub (1), and the lower side wall of each reinforcing rib is connected to the bottom surface of the corresponding first groove (11).

6. The axial-flow fan blade with the large hub ratio as claimed in claim 5, wherein: the end part of the hub (1) facing to the back pressure surface is provided with a second groove (14), and the second groove (14) is a truncated cone-shaped notch with a small inner end caliber and a large outer end caliber.

7. The utility model provides an axial fan, includes motor and axial fan blade, its characterized in that: the axial-flow fan blade is the axial-flow fan blade with a large hub ratio as claimed in any one of claims 1 to 6.